‘Track data,’ which includes the names, dates, numbers and codes stolen from credit and debit cards, can be used to make purchases online or create new, fraudulent cards. NBC’s Stephanie Gosk reports.

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This content comes from Closed Captioning that was broadcast along with this program.

>>>this is stephanie gosk in new york. roughly tens of millions of credit and
debit cards
are potentially compromised. names, numbers, dates and codes. it's what security officials call track data. hackers steal the it and criminals known as carders are already waiting to buy it. a well established
black market
network.

>>professionals that have been doing it for 10, 15 years already have the carders in place.

>> reporter: kevin mandy started the firm mandiant in
2004
. the the
chinese army
launched cyber attacks against dozens of u.s. companies for years.

>>there are people on a daily basis waking up trying to break into your networks. right now it is exceptionally complicated to defend your network.

>> reporter: track data can be used in multiple ways. carders will try to make purchases online. others may make fraudulent cards or what's called cloning. "wired" magazine showed how easy it is to print a card.

>>swipe the card through.

>> reporter: security experts
point out that not all the track data is useable. cards expire, personal information changes.

>>you go to the remainder and it is how they are used. whether they are sold to people or get in the hands of carders who are good and aggressive.

>> reporter: a number of retailers have been hacked. in
2007
, 90 million cards were stolen from tjx which owns
tj maxx
and home goods. foreign hackers were accused of stealing
credit card numbers
from retailers including 7-11, jetblue and
jc penney
.
security experts
say it might be just the first shoe to drop. that other big retailers are having issues. one of the difficulties in tracking down hackers is many of the large rings are overseas and the u.s. has little authority to go after them.